Real numbers - practice for 13 year olds
Number of problems found: 63
- Scientific notation mul
A student found the product of 8 × 10³ and 7 × 105 to be 5.6 × 108. What is the error? What is the correct product? Complete the explanation. - Is equal
Is it equal following terms? -9 21 = (-9) 21 - Two midpoints
Point A is on a number line halfway between -17 and 5. Point B is halfway between points A and 0. What integer does Point B represent? - Sum of absolute values
Is it possible for |r| + |s| = |r+s|? If so, when? - Overnight change
It was 13°C yesterday, but the temperature changed by -18.6° overnight. What is the temperature now? - The sum 10
The sum of the three decimals is 938.629. Two of them are 456.54 and 392.69. Find the third one. - Subtract 4
Subtract the following decimals. a. 0.98 - 0.053 b. 0.67 - 0.4 c. 0.3 - 0.002 d. 3.2 - .789 e. 6.53 - 4.298 f. 6 - 4.32 g. 7 - 3.574 h. 4.83 - 1.8 i. 3.7 - 1.8 j. 16.17 - 11.632 - Items
Items A costs 675.35 while item B costs 1605.25. How much more was the cost of item B than item A? How much would you pay if you purchased items A and B? - Josh works
Josh works mowing lawns and babysitting. He earns $7.20 an hour for mowing and $6.80 an hour for babysitting. How much will he earn for 1 hour of mowing and 6 hours of babysitting? - Rajendra
Rajendra, a farmer, had two sons and two daughters. He decided to divide his property among his sons and daughters. So he wrote a "WILL" about the distribution of his property. According to his "WILL," he desired to give 3/5 of the property to his sons in - Real estate
The residential house has three entrances numbered by odd numbers arithmetic progression. The sum of the two numbers on the corner entrances is 50. Calculate the highest of these three numbers. - Calculate 5274
Calculate the second sum if you know that one sum is -124.6 and the resulting sum is (-200). - Evaluate expression
What is: the sum of negative four and one-half times n plus the quantity one-fourth plus one and three-fourths times n minus three-eighths? - Numbers 83301
On the number line, display all real numbers greater than or equal to two and less than 5. - Sum and product
The sum of the real numbers x and y is 12. Their difference is 8. What is the value of xy? - Cube root
Find the cube root of 18 - Rail turn
The curve radius on the railway line is 532 m. The length of the rail track on it is 818 m. How many degrees is the angle ASB if A and B are boundary points and S is the center of the arc curve? - Angles
Find the interior angles of a rhombus with area 319.1 cm² and perimeter 72 cm. - Estate
Semicircle estate must be a fence. The straight section has a 26 meters long fence. How many meters of the fence should we buy? - Root
Use the law of square roots: cbrt (sqrt[2] (sqrt[4] (6))) = sqrt[n] (6)
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